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JavaQuery.java
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JavaQuery.java
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/**
* Copyright (c) 2002-2013 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.cypher.javacompat;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Transaction;
import org.neo4j.graphdb.factory.GraphDatabaseFactory;
import org.neo4j.helpers.collection.IteratorUtil;
import org.neo4j.kernel.impl.util.FileUtils;
public class JavaQuery
{
private static final String DB_PATH = "target/java-query-db";
String resultString;
String columnsString;
String nodeResult;
String rows = "";
public static void main( String[] args )
{
JavaQuery javaQuery = new JavaQuery();
javaQuery.run();
}
void run()
{
try
{
FileUtils.deleteRecursively( new File( DB_PATH ) );
}
catch ( IOException e )
{
throw new RuntimeException( e );
}
// START SNIPPET: addData
GraphDatabaseService db = new GraphDatabaseFactory().newEmbeddedDatabase( DB_PATH );
Transaction tx = db.beginTx();
try
{
Node myNode = db.createNode();
myNode.setProperty( "name", "my node" );
tx.success();
}
finally
{
tx.finish();
}
// END SNIPPET: addData
// START SNIPPET: execute
ExecutionEngine engine = new ExecutionEngine( db );
ExecutionResult result = engine.execute( "start n=node(*) where n.name! = 'my node' return n, n.name" );
// END SNIPPET: execute
// START SNIPPET: columns
List<String> columns = result.columns();
// END SNIPPET: columns
// START SNIPPET: items
Iterator<Node> n_column = result.columnAs( "n" );
for ( Node node : IteratorUtil.asIterable( n_column ) )
{
// note: we're grabbing the name property from the node,
// not from the n.name in this case.
nodeResult = node + ": " + node.getProperty( "name" );
}
// END SNIPPET: items
// the result is now empty, get a new one
result = engine.execute( "start n=node(*) where n.name! = 'my node' return n, n.name" );
// START SNIPPET: rows
for ( Map<String, Object> row : result )
{
for ( Entry<String, Object> column : row.entrySet() )
{
rows += column.getKey() + ": " + column.getValue() + "; ";
}
rows += "\n";
}
// END SNIPPET: rows
resultString = engine.execute( "start n=node(*) where n.name! = 'my node' return n, n.name" ).dumpToString();
columnsString = columns.toString();
db.shutdown();
}
}